JPH11280490A - Cam chain tensioner device of engine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure reliable working of a push rod and also reduce a friction loss of a rotary member by which oil in a working chamber is scattered, by forming an oil sump, which is opened to the edge of the working chamber side of a bottom wall of a cam chain chamber, in an engine body, and communicating it to the inside of the working chamber through a restriction hole. SOLUTION: A ring gear 121 is rotated in a working chamber 106, and oil in the working chamber 106 is stirred and scattered by the ring gear 121. An oil sump 137 for gathering scattered oil, which is opened to the edge of the working chamber 106 side of a bottom wall 124a of a cam chain chamber 124 where a cam chain 127, wrapped on a driving sprocket 125 and a driven sprocket, is run, is formed in an engine body 34. Besides, the oil sump 137 is communicated to the inside of the working chamber 106 through a restriction hole 149, therefore, during the operation of the engine, the level of oil in the working chamber 106 is reduced, because a part of the oil is gathered in the oil sump 137. Consequently, a friction loss caused by the rotation of the ring gear 121 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating member which is at least partially immersed in oil in an operating chamber formed between a crankcase and a crankcase cover, is fixed to the crankshaft, and transmits power from the crankshaft to the camshaft. An oil reservoir that opens in the bottom wall of the cam chain chamber that stores the cam chain that can run is supplied to the engine body to supply oil to the oil chamber that holds the position of the push rod against the reaction force from the cam chain. The present invention relates to a cam chain tensioner device for a vehicle engine formed.

[0002]

2. Description of the Related Art Conventionally, such an apparatus is disclosed in, for example,
It is already known from US Pat.

[0003]

However, in the above-mentioned prior art, the return oil after being supplied around the cylinder head is collected and supplied to the oil reservoir.
Immediately after the start of the engine or in a state where the engine body is oscillating, oil supply to the oil reservoir is uncertain, and sufficient oil does not accumulate in the oil reservoir, and the operation of the push rod may be uncertain.

[0004] The present invention has been made in view of such circumstances, and ensures the operation of the push rod by reliably supplying oil to the oil reservoir when the engine is operating.
In addition, it is an object of the present invention to provide a cam chain tensioner device for a vehicle engine that can reduce friction loss of a rotating member that scatters oil in an operating chamber.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a crankcase provided in an engine body, wherein a working chamber is formed between the crankcase and the crankcase, and a crankcase cover is fastened to the crankcase. A drive sprocket and a rotating member that at least partially immerses the oil in the working chamber to allow the oil in the working chamber to be scattered are fixed to the crankshaft that is rotatably supported by the case, and the driving sprocket is fixed in the working chamber. A cam chain chamber for movably storing an endless cam chain wound around a driving sprocket and a driven sprocket fixed to a cam shaft has a bottom wall of the cam chain chamber disposed above the bottom of the working chamber. Is formed on the engine body so as to extend substantially along the front-rear direction of the vehicle, and contacts the cam chain. The push rod, one end of which is connected to the tensioner member, is spring-biased in a direction to actuate the tensioner member in a direction to tension the cam chain, and holds the position of the push rod against a reaction force from the cam chain. A cam chain tensioner device for a vehicle engine, wherein an oil sump capable of supplying oil to an oil chamber facing the other end of the push rod is formed in the engine body so as to open to a bottom wall of the cam chain chamber. At
The oil sump is formed in the engine body by opening the bottom of the cam chain chamber at the working chamber side end of the cam chain chamber so as to collect oil scattered with the rotation of the rotating member. The oil reservoir is communicated with the working chamber through a throttle hole.

According to this configuration, the oil scattered by the rotation of the rotating member accompanying the rotation of the crankshaft is collected in the oil sump, so that the oil is reliably accumulated in the oil sump during operation of the engine. Thus, reliable operation of the push rod is enabled. In addition, the oil level of the oil in the working chamber is reduced due to a part of the oil being collected in the oil pool, so that the friction loss due to the rotation of the rotating member can be reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIGS. 1 to 10 show an embodiment of the present invention. FIG. 1 is a side view of a motorcycle to which the present invention is applied, and FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 1, FIG. 5 is a sectional view taken along line 5-5 of FIG. 7 is an enlarged sectional view of a main part of FIG. 5, FIG. 8 is a sectional view of 8-8 line in FIG. 5, FIG. 9 is a sectional view of 9-9 line in FIG. 2, and FIG. It is the figure which looked at the cover from the inside.

First, in FIG. 1, a body frame F provided in a motorcycle V as a small vehicle has a head tube portion 15 arranged to be inclined downward and forward, and a body tube F which is inclined downward and backward from the lower end of the head tube portion 15. A down tube portion 16 extending, a bottom tube portion 17 extending substantially horizontally rearward from a lower end of the down tube portion 16, and a rear tube portion 18 extending obliquely upward and rearward from a rear end of the bottom tube portion 17 are integrally formed. It is formed by bending a single steel pipe to have it.

[0010] The head tube portion 15, the front fork 19 and steering wheel 20 supporting a front wheel W _F is steerably supported, steering wheel 2
A headlight 21 is attached to 0. Steps 22 are attached to the lower portion of the down tube portion 16 and the bottom tube portion 17, and a support post 23a of a saddle 23 is inserted into an upper portion of the rear tube portion 17, and the support post 23a is positioned at the height of the saddle 23. Is adjustable and clamped to the upper end of the rear tube part 17 by the clamp tool 24.

[0011] the rear tube portion 17, together with the support bracket 25 is fixed, the support bracket 25 and the rubber holder 26 is fixed at a position above, the support bracket 25, which supports the rear wheel W _R The power unit P is pivotally connected via a support shaft 27 so as to be vertically swingable. In order to elastically restrict the swing of the power unit P about the axis of the support shaft 27, a power unit P is connected to a rubber 28 held by the rubber holder 26. The power unit P is connected.

[0012] to a position above the rear wheel W _R, the rear fender 2
A rear cover 30 that is integral with the rear cover 9 is disposed, and the rear cover 30 is attached to the clamp 24 and the rubber holder 26. Further, a lamp unit 31 including a taillight and a turn signal is attached to the rear end of the rear cover 30. In the rear cover 30, the fuel tank 3
2 are accommodated, and a part of the upper surface of the rear cover 30 is configured to be openable so that fuel can be supplied to the fuel tank 32.

2 and 3, a power unit P is a four-cycle, air-cooled, single-cylinder engine E.
When, and a transmission M, it is located on a side of the rear wheel W _R in the left toward the front of the motorcycle V.

The engine body 34 of the engine E has left and right crankcases 35, 36 integrally supporting left and right crankcases 35, 36 for rotatably supporting the crankshaft 40 and a cylindrical cylinder portion 37. And a head cover 39 connected to the cylinder head 38.

A combustion chamber 4 is provided between a cylinder 42 and a piston 42 which is slidably fitted to the cylinder portion 37.
3 is formed, and the piston 42 is connected to the connecting rod 4
4 and the crankshaft 4 via the crankpin 45.
Connected to 0. Engine body 34 Thus is disposed on the side of the rear wheel W _R in a posture tilted forward actuation axis of the pinion 42 until substantially horizontal.

A cam shaft 47 is rotatably supported by a cam holder 46 provided on the cylinder head 38. The cam shaft 47 has an intake cam 49 for opening and closing an intake valve 48, and an exhaust valve 50 for opening and closing. Exhaust cams 51 are provided integrally with each other.

4 and 5, the left crankcase 35 is integrally provided with an upwardly extending case portion 35a, and the right crankcase 36 is integrally provided with an upwardly extending case portion 36a. Provided, both case portions 35
The transmission case 52a and the transmission case 36a constitute a transmission case 52 fastened to each other.

A swing arm 53 extending toward the front of the motorcycle V above the engine body E is provided integrally with the case portion 35a of the left crankcase 35.
The swing arm 53 is the vertical cross section the rear wheel W _R perpendicular to the longitudinal direction of the motorcycle V is formed to have a shape that is open in a U-shape on the other side, yet the front portion of the swing arm 53 , the rear wheel W bulging portion 53a bulged in such a way as to wrap around the front side of the _R is formed.

At the front end of the swing arm 53, a hanger 54 is provided.
The hanger 54 is supported on the support shaft 27 supported by the bracket 25 of the vehicle body frame F via rubber bushes 55, 55.

A pair of connecting brackets 56, 56 located above the hanger 54 are integrally provided at the front end of the swing arm 53, and these connecting brackets 56, 56 are held by the rubber holder 26. Rubber 28.

Swing arm 53 on the opposite side of the rear wheel W _R [0021]
The air cleaner cover 58 is provided with a plurality of bolts 57.
Is concluded. The partition wall 59 provided at an intermediate portion of the swing arm 53 along the front-rear direction of the motorcycle V and the partition wall 60 provided on the air cleaner cover 58 corresponding to the partition wall 59 come into contact with each other. Between the arm 53 and the air cleaner cover 58, a front air cleaner chamber 61 and a rear carburetor storage chamber 62 are formed.

A support wall 63 is provided between the upper end and the lower side wall of the swing arm 53 between the front end of the swing arm 53 along the front-rear direction of the motorcycle V and the partition wall 59, and the support wall 63 and the swing arm 53 are provided. At the end of the front side wall on the air cleaner cover 58 side, a fitting recess 64 is formed in an endless shape corresponding to the bulging portion 53a of the swing arm 53. Are fitted. In addition, the air cleaner cover 58 is provided with a holding projection 66 for holding the cleaner element 65 between the support wall 63 and the leading end of the cleaner element 65 to contact the support wall 63.
Screw member 6 inserted through the holding wall portion 66 from outside of the screw member 6
7 is screwed into the support wall 63.

The air cleaner chamber 61 is moved by the cleaner element 65 into the unpurified chamber 61a in the bulging portion 53a.
And the other purification chamber 61b, and outside air is introduced into the unpurified chamber 61a.

In FIG. 6, an air inlet 68 communicating with the unpurified chamber 61a is provided in the bulging portion 53a of the swing arm 53 on the side opposite to the air cleaner cover 58. A cover 69 is provided integrally with the bulging portion 53a.

In the air cleaner chamber 61, a plurality of mutually intersecting ribs 70 are integrally provided on the inner surface of the swing arm 53. Each rib 70 contacts the cleaner element 65 in the unpurified chamber 61a. However, in order to prevent the unpurified chamber 61a from being divided into a plurality of sections by the ribs 70, the ends of the ribs 70 on the cleaner element 65 side in the unpurified chamber 61a are substantially U-shaped.
A notch 71 is provided. Therefore, the air introduced from the air inlet 68 into the unpurified chamber 61a is distributed and circulated through the cleaner element 65 over substantially the entire surface thereof, and the air purified by the cleaner element 65 is led to the purifying chamber 61b.

A vaporizer 74 is stored in the vaporizer storage chamber 62. That is, the swing arm 53 is located above the cylinder head 38 of the engine body 34 and the carburetor 74 is stored in the carburetor storage chamber 62 formed between the swing arm 53 and the air cleaner cover 58. The arm 53 is swingably connected to the support bracket 25 of the body frame F in an arrangement separating the cylinder head 38 and the carburetor 74.

A rubber inlet-side connecting pipe 75 is fitted and connected to the inlet of the vaporizer 74. The inlet-side connecting pipe 75 is sandwiched between the partition walls 59 and 60 so as to communicate with the purification chamber 61b. .

At the outlet of the vaporizer 74, one end of an outlet-side connecting pipe 76 bent in a substantially L-shape is fastened, and at the other end of the inlet-side connecting pipe 76, a flange 77 is provided.
On the other hand, an insertion hole 78 is provided in the swing arm 53,
On the outer and inner surfaces of the swing arm 53, mounting seat surfaces 79 and 80 surrounding the insertion hole 78 are formed, respectively. Thus, the flange 77 of the outlet connection pipe 77 and the mounting seat surface 7
A heat insulating material 81 is interposed between the heat insulating material 9 and the heat insulating material 9. One end of an intake pipe 82 is inserted into the outlet side connection pipe 77 through the insertion hole 78 and the heat insulating material 81, and the other end of the intake pipe 82 is connected to the cylinder head 38. Moreover, the intake pipe 82
The flange 8 is in contact with the mounting seat surface 80
3 are secured, and a plurality of flanges 77, 82 sandwiching the heat insulating material 81 and the swing arm 53 therebetween are tightened by a plurality of, for example, a pair of bolts 84, 84.

As a result, the vaporizer 74 is connected to the swing arm 5
The suction pipe 82 fixed to the swing arm 53 and connected to the cylinder head 38 is connected to the carburetor 74 through the swing arm 53.

A throttle wire 85 for driving a throttle valve (not shown) of the carburetor 74 extends through the upper part of the swing arm 53 toward the steering handle 20 and is connected to the fuel tank 32 (see FIG. 1). Carburetor 7 to switch between supply and cutoff of fuel from fuel introduction pipe 86
The fuel cock 87 attached to 4 protrudes out of the air cleaner cover 58 so as to enable operation from outside the air cleaner cover 58. In addition, a portion of the air cleaner cover 58 corresponding to the vaporizer storage chamber 62 is provided with a plurality of air passages for allowing air to flow between the inside and the outside of the vaporizer storage chamber 62 to prevent the vaporizer storage chamber 62 from becoming high temperature. Are provided.

An exhaust pipe 89 for guiding exhaust gas from the cylinder head 38 extends below the power unit P and above the rear side to the upper part of the two case parts 35a, 36a, and is supported above the two case parts 35a, 36a. Connected to muffler 90.

An input gear 94 meshed with an output gear 93 fixed to one end of the crankshaft 40 is provided in the transmission case 52 formed by the two case portions 35a and 36a.
, The transmission M and the starting clutch 95 interposed between the input gear 94 and the transmission M are housed.

The input gear 94 and the starting clutch 95
It is mounted on a fixed main shaft 96 having an axis parallel to the crankshaft 40 and having both ends in the axial direction supported by the two case portions 35a and 36a. The transmission M has a main shaft 96 and a final shaft 97 having an axis parallel to the main shaft 96 and having one end protruding from the case portion 36a and rotatably supported by the two case portions 35a, 36a. , A plurality of gears, for example, four gear trains 98, 99, 100, 1 that are established by being selectively switched.
01 is provided, and a tire 102 is provided at an end of the final shaft 97 protruding from the transmission case 52.
Wheel 103 which constitutes the rear wheel W _R is fixed with. In addition, the wheel 103 has a drum brake 104
Is attached.

Left crankcase 3 including case 35a
A crankcase cover 105 is connected to the right crankcase 36 from the side opposite to the right crankcase 36, and an operating chamber 10 is provided between the left crankcase 35 and the crankcase cover 105.
6 are formed. The working chamber 106 has a magnet 1 on the inner surface of a bowl-shaped outer cylinder 107 fixed to the crankshaft 40.
A generator 111 having a rotor 109 to which a 08 is fixed and a stator 110 fixed to the crankcase cover 105 is housed.

A kick spindle 112 having an axis parallel to the crankshaft 40 is rotatably supported on the crankcase cover 105. An end of the kick spindle 112 projecting outward from the crankcase cover 105 is attached to the end of the kick spindle 112. The kick pedal 113 is fixed. Kick spindle 112 has kick spindle gear 114
A gear train 115 including the kick spindle gear 114 is connected to the crankshaft 40 via a starting clutch 116. Further, between the crankcase cover 105 and the kick spindle gear 114, a torsion spring 117 is provided.
7 indicates the kick pedal 113, that is, the kick spindle 11 when the depression operation of the kick pedal 113 is completed.
2 exerts a spring force to return it to its original position.

A starter motor 118 is housed and fixed in the case portion 35a of the left crankcase 35. An output gear 119 provided on an output shaft of the starter motor 118 is integrated with the crankshaft 40. A ring gear 121 serving as a rotating member can be connected via an overrunning clutch 120.

The ring gear 121 is integrally formed by subjecting the outer cylinder 107 of the rotor 109 of the generator 111 to burring, fine blanking, or the like on the open end of the bowl-shaped outer cylinder 107. You. Thus, the ring gear 121 is connected to the outer cylinder 10 of the generator 111.
7, the number of parts and the number of assembling steps can be reduced.
Can also be increased.

In the engine body 34, a cam chain chamber 124 is formed in the cylinder head 38 and the head cover 39 so as to extend in a substantially horizontal direction through the working chamber 106. In the working chamber 106, a generator 111 and a left crankcase are formed. 35, the drive sprocket 125 fixed to the crankshaft 40 and the cam chain chamber 12
Endless cam chain 127 wound around a driven sprocket 126 fixed to the camshaft 47 in the camshaft 47
Is movably stored in the working chamber 106 and the cam chain chamber 124.

Working chamber 106 and cam chain chamber 124
A cylindrical boss 128 is provided integrally with the left crankcase 35 so as to have an axis parallel to the crankshaft 40 in the vicinity of the connection part. Are swingably supported. A tension sprocket 131 as a tensioner member is provided at one end of the tensioner arm 130.
The tension sprocket 131 is engaged with the cam chain 127 and the tensioner arm 13 is
The upper end of the push rod 132 is connected to the other end of the zero.

Incidentally, the cam chain chamber 124 is formed in the engine body 34 with its bottom wall 124a disposed above the bottom of the working chamber 106, and is formed in the working chamber 106 of the bottom wall 124a of the cam chain chamber 124. The oil separator 133 disposed at the end on the side of the left crankcase 3
5 is fastened.

Referring to FIGS. 7 and 8, a recess 134 opened toward the crankcase cover 105 is provided at an end of the bottom wall 124a on the side of the working chamber 106 so as to approach and face the outer periphery of the ring gear 121. Arc-shaped wall portion 135 is provided so as to be interposed between the working chamber and the wall portion 135.
The oil separator 133 is fastened to the left crankcase 35 with bolts 136 so as to close the opening of the recess 134 on the crankcase cover 105 side.

Thus, the recess 134 and the oil separator 133 form an oil sump 137 that opens to the bottom wall 124a of the cam chain chamber 124. On the other hand, oil is stored in the working chamber 106, and the oil scattered by the ring gear 121 rotating in the direction indicated by the arrow 138 in FIG. .

The oil separator 133 is integrally provided with a bottomed guide cylinder 139 that extends vertically inside the oil reservoir 137 and has an open upper end, with the upper end positioned below the bottom wall 124a of the cam chain chamber 124. , A cylindrical push rod 132 is slidably fitted to the guide cylinder 139.

A hydraulic pressure 140 is formed between the lower end of the push rod 132 and the closed end of the guide cylinder 139. The oil chamber 140 accommodates a spring 141 that exerts a spring force for pushing the push rod 132 upward. You. Moreover, the rubber member 1 fixed to the upper end of the push rod 132
42 is in contact with the other end of the tensioner arm 130, and a spring 141 pushes the tensioner arm 130 via a push rod 132 to the tension sprocket 13.
1, the cam chain 127 is urged to rotate in the direction of tension.

A check valve 143 is provided at the lower part of the push rod 132, and the oil in the oil sump 137 is pushed at the upper part of the push rod 132.
An introduction hole 144 leading into the inside 32 is provided.

The check valve 143 allows the oil to flow into the oil chamber 140 when the push rod 132 moves upward due to the spring force of the spring 141. However, when the push rod 132 is pressed downward, the check valve 143 opens the oil chamber 140. The lock state is set. That is, the push rod 1
When a reaction force is received from the cam chain 127 which is urged by a spring in the tensioning direction, the position of the oil chamber 140 is held with the oil chamber 140 locked.

Referring to FIG. 9 as well, in the left crankcase 35, an oil sump 137 is provided in both the left and right crankcases 3.
The left and right crankcases 35 and 36 are provided with oil reservoirs 146 communicating with the communication holes 145 and the bottoms of the crankcases 35 and 36, respectively. Ribs 147 formed between them,
148 are provided to abut each other. Moreover, each of the ribs 147 and 148 is formed in an arc shape close to and opposed to the outer periphery of the crankshaft 40 and the output gear 93, and the upper end of each of the ribs 147 and 148 is formed in the cam chain chamber 1.
42 is disposed at a position substantially corresponding to the bottom wall 142a.

The left crankcase 35 is provided with a throttle hole 149 for communicating the lower part of the oil reservoir 146 with the lower part of the working chamber 106, and overflows the ribs 147 and 148 to the crankshaft 40 and the output gear 93 side. A throttle hole 150 for returning the flowing oil to a lower portion in the working chamber 106
Is provided.

When the engine E is stopped, oil is stored in the working chamber 106 up to a line L _S indicated by a dashed line in FIG. 7, but the rotor 109 rotates with the operation of the engine E. As a result, the scattered oil accumulates in the oil sumps 137 and 146, and the return of the oil from the oil sump 146 to the inside of the working chamber 106 is restricted by the throttle hole 149. Therefore, when the engine E is operating, it is indicated by a chain line L _O. As a result, the oil pool changes to a level determined by the oil pools 137 and 146, and the portion of the ring gear 121 that is immersed in oil becomes smaller.

Referring also to FIG. 10, the case portion 35a
In the upper portion between the left crankcase 35 and the crankcase cover 105 including
An oil collecting chamber 153 having an inlet 152 for receiving the oil scattered at 21 is formed by bringing ribs 154 and 155 provided on the left crankcase 35 and the crankcase cover 105 into contact with each other.

The oil collecting chamber 153 includes the ring gear 1
An inlet 152 is arranged between the left crankcase 35 and the crankcase cover 105 so as to receive oil which has been scattered by the rotation of the cylinder 21 and moved along the inner surfaces of the left crankcase 35 and the crankcase cover 105. , The left crankcase 35 and the crankcase cover 105 are provided with guide walls 156 and 157 for guiding the oil that has moved along their inner surfaces to the inlet 152.

Further, the oil collecting chamber 153 is connected to the inlet 1
The left crankcase 35 and the crankcase cover 105 are provided with control walls 161, 162; 163, 164, which come into contact with each other in a pair, with the oil collecting chamber. 153
163, 163 and 164, the inside of the oil collecting chamber 153 is gradually lowered as it moves away from the entrance 152 side. Each control wall 16 is partitioned into storage portions 158, 159, and 160.
1, 162; 163, 164 are the uppermost reservoirs 158;
From the storage section 160 at the bottom through the storage section 159 in the middle.
It is formed so that the oil overflows sequentially.

Moreover, each of the storage sections 158, 159, 160
Can supply oil to different parts to be lubricated,
A gear train 98 to 10 is provided on the main shaft 96 of the transmission M.
1 and a lubricating oil passage 165 for supplying oil to the starting clutch 95 is provided coaxially so as to communicate with the storage portion 158. The final shaft 97 of the transmission M is provided with the gear trains 98 to 101. A lubricating oil passage 166 for supplying oil to the other portion is provided coaxially so as to communicate with the reservoir 159, and a lubricating oil passage for supplying oil to the camshaft 47 is provided in the left crankcase 35 and the cylinder head 38. A path 167 is provided so as to communicate with the storage section 160.

By the way, the left and right crankcases 35, 3
6, the oil is agitated by the crankshaft 40 and the output gear 93.
8, the oil scattered upward by the crankshaft 40 and the output gear 93 is supplied to the left and right crankcases 35 and 36 by the oil scattered in the direction indicated by the arrow 168. Guide walls 169 leading to the sides 40 and 54 for lubrication between the crank pins 45 are provided in an arc shape corresponding to the outer periphery of the input gear 94, the starting clutch 95 and the gear trains 98 to 101. The oil that falls downward from the lubricating oil passage 165 in the main shaft 96 via the lubricating portions of the gear trains 98 to 101 is also guided toward the crankshaft 40 and the crankpin 45 by the guide walls 169.

Next, the operation of this embodiment will be described. The power unit P is swingably supported on the vehicle body frame F via a swing arm 53 connected to the engine main body 34 of the engine E. E is swingably connected to the vehicle body frame F so as to separate the cylinder head 38 and the carburetor 74. Therefore, the swing arm 53 interposed between the cylinder head 38 and the carburetor 74 can prevent the adverse effect of the heat from the cylinder head 38 from affecting the carburetor 74 as much as possible. Therefore, it is possible to prevent the performance of the vaporizer 74 from deteriorating as much as possible. Moreover, the swing arm 53 is for swinging and supporting the power unit P to the body frame F,
The adverse effect of heat from the cylinder head 38 is caused by the vaporizer 74.
Therefore, it is unnecessary to provide a dedicated member for preventing the number of components from increasing, and an increase in the number of components can be avoided.

The carburetor 74 is fixed to the swing arm 53, and an intake pipe 82 connected to the cylinder head 38 and fixed to the swing arm 53 is connected to the carburetor 74 through the swing arm 53. Therefore, a large strength for supporting the carburetor 74 on the intake pipe 82 is not required, and the size and weight of the intake pipe 82 can be reduced. In addition, since the carburetor 74 is rigidly supported by the swing arm 53, it is possible to prevent the vibration from the engine body 34 from adversely affecting the carburetor 74,
It is possible to prevent performance degradation of the vaporizer 74 due to vibration.

When the ring gear 121 rotates in the working chamber 106, the oil in the working chamber 106 is stirred and scattered by the ring gear 121, and the oil sump 137 that collects the scattered oil is driven by the driving sprocket 125.
In the bottom wall 124a of the cam chain chamber 124 for running the cam chain 127 wound around the driven sprocket 126, an opening is formed in the engine body 34 at the end on the working chamber 106 side. Moreover, since the oil reservoir 137 communicates with the working chamber 106 through the throttle hole 149, the working chamber 106
The oil level of the oil inside falls due to a part of the oil being collected in the oil sump 137, so that the friction loss due to the rotation of the ring gear 121 can be reduced.

Further, the oil sump 137 can supply oil to an oil chamber 140 facing one end of a push rod 132 having one end connected to a tension sprocket 131 contacting the cam chain 127. At times, the oil is reliably stored in the oil reservoir 137, and the push rod 132 can be reliably operated.

Further, between the left crankcase 35 and the crankcase cover 105, an oil collecting chamber 153 having an inlet 152 for receiving the oil scattered by the rotation of the ring gear 121 in the working chamber 106 is formed.
As the inside of the oil collecting chamber 153 moves away from the entrance 152 side, the oil collecting chamber 153 gradually lowers and is partitioned into a plurality of storage portions 158, 159, 160 respectively connected to different lubricated portions. Control walls 161, 162; 163, 164 for sequentially overflowing the oil to the lowermost storage section 160 via the section 159 are provided on the bottom wall 153 a of the oil collecting chamber 153. Therefore, the oil collected in the oil collecting chamber 153 is removed from the control walls 161, 162;
The oil stored in each of the storage portions 158 to 159 overflows and is sequentially stored in each of the storage portions 158 to 159, and the oil stored in each of the storage portions 158 to 159 is supplied to the corresponding lubricated portion. The oil can be supplied with an appropriate distribution.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, the present invention can be applied to a scooter type motorcycle.

[0062]

As described above, according to the present invention, the oil scattered by the rotation of the rotating member is reliably collected in the oil reservoir, thereby enabling the push rod to be reliably operated and the rotating member to be rotated. Friction loss due to rotation can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 2;

FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. 5;

FIG. 7 is an enlarged sectional view of a main part of FIG. 5;

FIG. 8 is a sectional view taken along line 8-8 in FIG. 5;

FIG. 9 is a sectional view taken along line 9-9 of FIG. 2;

FIG. 10 is a view of the crankcase cover as viewed from the inside.

[Explanation of symbols]

34 ... Engine body 35 ... Crankcase 45 ... Crankshaft 47 ... Camshaft 105 ... Crankcase cover 106 ... Working chamber 121 ... Ring gear as a rotating member 124 ... Cam chain chamber 124a ・ ・ ・ Bottom wall 125 ・ ・ ・ Drive sprocket 126 ・ ・ ・ Driving sprocket 127 ・ ・ ・ Cam chain 131 ・ ・ ・ Tension sprocket as a tensioner member 132 ・ ・ ・ Push rod 137 ・ ・ ・ Oil reservoir 140 ... Oil chamber 149 ... Restriction hole V ... Motorcycle as vehicle

Claims (1)

[Claims] An operating chamber (106) is formed between a crankcase (35) of the engine body (34) and the crankcase (35) to form a crankcase cover (1).
05) is fastened to the crankshaft (40), which is rotatably supported by the crankcase (35), so that the drive sprocket (125) and the oil in the working chamber (106) can be scattered. A rotating member (121) at least partially immersed in oil in (106) is fixed in the working chamber (106), and a driven sprocket (126) fixed to the driving sprocket (125) and the camshaft (47). ), A cam chain chamber (124) for movably storing an endless cam chain (127) is wound on the bottom wall (124a) of the cam chain chamber (124) from the bottom of the working chamber (106). Is formed on the engine body (34) so as to extend substantially along the front-rear direction of the vehicle (V), Push rod (13 having one end to the tensioner member (131) is connected to contact 27)
2) is spring-biased in a direction to actuate the tensioner member (131) in a direction of tensioning the cam chain (127), and the push rod (132) is opposed to a reaction force from the cam chain (127). The oil chamber (14) facing the other end of the push rod (132) to maintain the position
An oil sump (137) capable of refueling the cam chain tensioner (0) is formed in the engine main body (34) by opening to the bottom wall (124a) of the cam chain chamber (124). In the above, the oil sump (1
37) is capable of collecting oil scattered with the rotation of the rotating member (121), and enables the operation chamber (1) of the bottom wall (124a) of the cam chain chamber (124) to be collected.
The oil reservoir (137) is formed in the engine body (34) with an opening at the end on the 06) side.
A cam chain tensioner device for a vehicle engine, wherein the cam chain tensioner device communicates with the inside of the vehicle through a throttle hole (149).